How can you make a line shorter without erasing any part of it?
你怎样才能在不擦去任何一部分的情况下使一条线变短？
So an easy thing to do in planar geometry is I want to make a line segment.
在平面几何里比较容易的一件事，就是做一个线段。
我能画条线。
Let's make a line and go through the hole.
让我们站成一队，钻过这个洞。
He used his sword to make a line in the sand.
他用他的剑在沙滩上划了一条线。
With points you can make a line; with line, planes; with planes, solids.
用点画成线，用线画成平面，用平面画成立体。
With points you can make a line; with lines, planes; with planes, solids.
用点画成线，用线画成平面，用平面画成立体。
With points you can make a line; with lines, planes; with planes, solids.
用点画成线，用线画成平面，用平面画成立体。
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